"Look out how you use proud words. When you let proud words go, it is not easy to call them back. They wear long boots, hard boots; they walk off proud; they can't hear you calling. Look out how you use proud words."

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By a man's finger-nails, by his coat-sleeve, by his boots, by his trouser-knees, by the callosities of his forefinger and thumb, by his expression, by his shirt-cuff — By each of these things a man's calling is plainly revealed. That all united should fail to enlighten the competent inquirer in any case is almost inconceivable. You know that a conjurer gets no credit when once he has explained his trick; and if I show you too much of my method of working, you will come to the conclusion that I am a very ordinary individual after all.

— Arthur Conan Doyle